Sensitizing solution and process of making same



Patented Aug. 31, 1926.

UNITED STATES PATENT OFFICE.

GLEN KEEL, OF INDIANAPOLIS, INDIANA, ASSIGNOR T0 MOORE BROTHERS COMPANY, A PARTNERSHIP COMPOSED OF FRED H. MOORE, JAMES R. MOORE, AND LEVI I. MOORE, OF ROCHESTER, INDIANA.

' SENSI IITIZIIN'G SOLUTION AND PROCESS OF MAKING SAME.

11o Drawing.

This invention relates to a sensitizing solution and process of making the same, which solution is used for treating fine mesh fabrics or screens or any other material of a suitable nature, whereby such material will be affected by the application of light so as to permit of the printing of pictures 01' designs thereon.

One object of the invention is to provide a solution of this character which may be employed in the art of reproducing pictures or the like by a multicolor process wherein the colorin is forced through a fine mesh screen. or this purpose the screen is treated with the solution so as to originally render it impervious, but permit of the picture being printed thereon through the medium of a ne ative so that the details of the picture wil be outlined by a portion of the screen rendered pervious or open as will be hereinafter more fully described.

This invention relates to a sensitizing solution embodying the following ingredients, which are found to be preferable. However, substitutions of ingredients having similar properties may be'had as well as variations 1n their relative proportions, without departing from the invention.

The ultimate solution is made of three preliminary solutions. The first of such S0- lutions com ises substantially 1 quart of fish glue 0 the best quality, (preferably Le Pages photo engravingglue), the glue being mixed thoroughly with approximately 48 ounces of boiling hot water. Into this solution there is mixed substantially 4 ounces of pulverized bichromate of ammonia. The solution thus,produced is then allowed to become stone cold. A second solution is then mixed comprising substantially 2 ounces of powdered egg albumen, which is mixed thoroughly in about 14 ounces of cold water and substantially 4 ounces of clear ammonia. The third solution comprises about one-half an ounce of nitrate of silver mixed in substantially.32 ounces of cold water, which is thoroughly agitated. The first two solutions, the glue solution being cold, are thoroughly mixed together, and thereafter the third or nitrate solution is mixed therewith and the whole combined solution is strained through Application filed May 2, 1925. Serial No. 27,341.

a fine cloth and placed in a suitable bottle, such as an amber bottle and well corked.

In the use of this solution, screens are provided for the multicolor process, said screens ordinarily comprising a very fine ,mesh silk fabric stretched on a frame. The operation is conducted in a dark room or before a ruby lamp, the solution being poured over one side of the screen, the excess draining into a suitable pan, after which the screen is put away in a dark place to dry. The drying of the solution on the screen becomes suificiently hard to provide a skin over one surface thereof s as to render it substantially imperviom After that, the solution is then washed ovethe other side of the screen, it being prevented from passing therethrough by reason of the first ap lication. The screen thus treated on hot sides is then placed away to dry.

In the use of such a screen, the solution is such that it first has the effect of rendering the fabric impervious, and it is sensitive to light. Therefore, what we may call a negative plate, such as a glass or celluloid or halftone negative, eto., having a transparent portion and a blocked out and opaque portion, ma be printed on the screen by placing it directly in contact therewith and exposing it to the light in the usual manner of printing. The light striking the sensi- *tized screen through the transparent part of the negative or plate, has the effect of so hardening the suface as to prevent the solution being readily washed from the fabric. However, that portion of the treated fabric which is unexposed to the light by reason of the o aque portion of the negative, is unaffecte and capable of being readily washed from the fabric. After such printing the fabric may be assed through a bath of water which will ave no effect over the ortion exposed to the light, but which wi wash the solution out of the unexposed portion. Therefore, a screen will be had after exposure, having its surface impervious excepting 'that portion representing a picture or design which has been blocked out on the negative, or the portion representing the halftone dots in case of a halftone negative being used, such portion bein open. The screen after thus being treate may then be used for prints or the like, by forcing the color through the screen, whereby it will pass onto the print through the open mesh and be prevented from passing through the remainim or impervious portion of the screen. uch use of the solution hasbeen fully set out in the copending application above referred to.

While the sensitizing solution herein described is particularly adaptable for use in connection with the method of producing multicolored pictures and designs, as set forth, its use for other purposes will be readily apparent, such as producing pervious and impervious designs on fabrics, screens or the like, etc. Furthermore, while a particular solution and the method of producing the same has been set forth in de tail, there may readilybe used substitutes for the various ingredients having the same or similar qualities, as well as varying the method of producing the final solution and with respect to the relative quantities of the ingredients employed.

This is an alkaline solution, as distinguished from an acid solution, for in the process of use thereof above mentioned an acid sensitizer or anything with acid in it could not be used. .The chief use of this invention is not in plate making, but one wherein multiple colors are forced through apertures or the open mesh of a fabric, like a stencil, and wherein special oil pastes are forced through the mesh, and this is impossible with an acid solution.

The invent-ion claimed is:

1. A sensitizing solution consisting of glue, water, bichromate of ammonia, egg albumen, clear ammonia and nitrate of silver substantially as set forth.

2. A sensitizing solution'consisting substantially of a quart of fish glue, 4 ounces of bichromate of ammonia, 2 ounces of egg albumen, 1 ounce of nitrate of silver and water suflicient to produce the desired consistency, substantially as set fort 3. The process of making a sensitizing solution consisting of first mixing a solution of fish glue bichromate of ammonia and hot water, mixing a solution of powdered egg albumen, clear ammonia and cold water, mixing a solution of nitrate of silver and water, and thereafter mixing all three of said solutions together to form the ultimate solution.

4. The process of making a sensitizing solution consisting of mixing a solution of substantially one quart of fish glue with substantially 48 ounces of boiling hot water, and adding thereto substantially 4 ounces of pulverized bichromate of ammonia therewith and allowing said solution to become cold, mixing a solution of substantially 2 ounces of powdered egg albumen and mixing the same thoroughly with substantially 14 ounces of cold water and 4 ounces of clear ammonia, mixing a solution of substantially ounce of nitrate of silver and substantially 32 ounces of cold water, agitating the latter solution, and thereafter thorou hly mixing all of said solutions together to Eorm the ultimate solution.

In witness whereof, I have hereunto affixed my signature.

GLEN IRVIN KEEL.

used for prints or the like, by forcing the color through the screen, whereby it will pass onto the print through the open mesh and be prevented from passing through the remainin or impervious portion of the screen. uch use of the solution has been fully set out in the copending application above referred to.

While the sensitizing solution herein described is particularly adaptable for use in connection with the method of producing multicolored pictures and designs, as set forth, its use for other purposes will be readily apparent, such as producing pervious and impervious designs on fabrics, screens or the like, etc. Furthermore, while a particular solution and the method of producing the same has been set forth in detail, there may readilybe used substitutes for the various ingredients having the same or similar qualities, as well as varying 'the method of producing the final solution and with respect to the relative quantities of the ingredients employed.

This is an alkaline solution, as distinguished from an acid solution, for in the process of use thereof above mentioned an acid sensitizer or anything with acid in it could not be used. The chief use of this invention is not in plate making, but one wherein multiple colors are forced through apertures or the open mesh of a fabric, like a stencil, and wherein special oil pastes are forced through the mesh, and this is impossible with an acid solution.

The invention claimed is:

1. A sensitizing solution consisting of glue, Water, bichromate of ammonia, egg albumen, clear ammonia and nitrate of silver substantially as set forth.

2. A" sensitizing solution'consisting substantially of a quart offish glue, 4 ounces of bichromate of ammonia, 2 ounces of egg albumen, 1 ounce of nitrate of silver and Water suflicien-t to produce the desired consistency, substantially as set forth.

3. The process of making a sensitizing solution consisting of first mixing a solution of fish glue, bichromate of ammonia and hot water, mixing a solution of powdered egg albumen, clear ammonia and cold Water, mixing a solution of nitrate of silver and water, and thereafter mixing all three of said solutions together to form the ultimate solution.

4. The process of making a sensitizing solution consisting of mixing a solution of substantially one quart of fish glue with substantially 48 ounces of boiling hot water, and adding thereto substantially 4 ounces of pulverized bichromate of ammonia there with and allowing said solution to become cold, mixing a solution of substantially 2 ounces of powdered egg albumen and mixing the same thoroughly with substantially 14 ounces of cold water and 4 ounces of clear ammonia, mixing a solution of substantially ,5 ounce of nitrate of silver and substantially 32 ounces of cold water, agitating the latter solution, and thereafter thoroughly mixing all of said solutions together to form the ultimate solution.

In Witness whereof, I have hereunto affixed my signature.

GLEN IRVIN KEEL.

GERTIFI GATE 0F CORRECTION.

Patent No. 1,597,899.

Granted August 31, 1926, to

GLEN IRVIN KEEL.

It is hereby certified that the above numbered patent was erroneously issued to Moore Brothers Company, as sssignee of the entire interest in said invention, whereas said Letters Patent should have been issued to the inventor, said Keel and Moore Brothers Company, said Consny, being sssignce of one-half interest only in said invention, as shown by the records of assignments in this office; sad that the said Letters Patent should he told with this correction therein that the some may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of March, A. D. 1927.

seal.

M. J. Moore. Acting Gonnnissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,597,899. Granted August 31, 1926, to

GLEN IRVIN KEEL.

It is hereby certified that the above numbered patent was erroneously issued to Moore Brothers Company, as assignee of the entire interest in said invention, whereas said Letters Patent should have been issued to the inventor, said Keel and Moore Brothers Company, said Goqasny, being assignee of one-half interest only is said invention, as shown by the records of assignments in this office; and that the said Letters Patent should he read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of March. A. D. 1927.

M. J. Moore.

5881' I Acting Connnissioner of Patents. 

